Computations of the acoustic field in an annular gas turbine combustion chamber

Szász, Róbert Zoltán and Duwig, Christophe and Fuchs, László (2007) Computations of the acoustic field in an annular gas turbine combustion chamber. JOURNAL OF COMPUTATIONAL AND APPLIED MECHANICS, 8 (2). pp. 193-210. ISSN 1586-2070

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Abstract

The acoustic field in an annular gas turbine combustion chamber is determined using a hybrid approach. The flow solver is based on Large Eddy Simulations to account for turbulence and on a flamelet-based method to model combustion. The acoustic part solves an inhomogeneous wave equation, the acoustic sources being given by the flow solver. The flow computations focus on a single nozzle. To model the entire combustion chamber, the acoustic sources are manifold and imposed in thirty instances. Several perturbing parameters were studied. The computations revealed that time shift in the acoustic sources of consecutive nozzles has a major influence on the resulting acoustic field, space shift of the sources or counter rotation has reduced effect.

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